Top 550+ Solved Fluid Mechanics and Hydraulic Machines MCQ Questions Answer
Q. Which one of the following is an integrator
a. Bus-bar
b. Exciter
c. Transformer
d. Lightning arrestor
e. Oil circuit breaker
Q. In a Buttress dam, when the height of dam is 10 m to 25 m, the spacing of buttress is usually restricted to
a. 10 to 15 m
b. 4.5 to 6 m
c. 20 to 25 m.
d. 1.5 m
e. 1 m
Q. A mercury water manometer indicates a gauge difference of 400 mm. The difference in pressure, measured in metres of water, is
a. 0.4
b. 0.8
c. 1088
d. 5.44
e. None of the above
Q. The equation of continuity of flow is applicable when
a. The flow is one dimensional
b. The flow is steady
c. The flow is compressive
d. The velocity is uniform over the cross section
e. None of the above
Q. A turbine model test with 260 mm diameter showed an efficiency of 90 percent. The efficiency that can be expected from a 1.2 m diameter impeller is
a. 90 percent
b. 81 percent
c. 91 percent
d. 93.18 percent
e. None of the above
Q. Notch is a device used for measuring
b. Velocity through a pipe
c. Rate of flow through a small channel
d. Velocity through a small channel
e. Rate of flow through pipes
Q. While calculating the specific speed of double suction pump, the discharge to be considered is
a. Square of the actual discharge
b. Actual discharge
c. Double of the actual discharge
d. Square root of actual discharge
e. Half of actual discharge
Q. In an impulse turbine
a. Water must be admitted over the whole circumference
b. It is not possible to regulate the flow without loss
c. Wheel must run full and kept entirely submerged in water below the tailrace
d. The pressure in the driving fluid as it moves over the vanes is atmospheric
e. None of the above
Q. The Weber number is the ratio of
a. Inertial forces to surface tension force
b. Elastic forces to pressure forces
c. Viscous forces to gravity
d. Elastic forces to gravity
e. Intertial forces to viscous forces
Q. A hydraulic jump is classified on the basis of initial
a. Weber number
b. Froude number
c. Mach number
d. Reynolds number
Q. Water hammer in pipes takes place when
a. 51.3
b. flowing fluid is gradually brought to rest
c. fluid is flowing with high pressure
d. fluid is flowing with high velocity
e. flowing fluid is suddenly brought to rest by closing the valve
Q. Multistage centrifugal pumps are used
a. To produce high heads
b. To give high discharge
c. A and B above together
d. To pump viscous liquids
e. None of the above
Q. When the water flows over a rectangular suppressed weir the pressure beneath the nappe is
a. Atmospheric
b. Slightly above atmospheric
c. Vacuum
d. Very high
e. Negative
Q. Stremlines, streak lines and path lines are all identical in case of
a. Steady flow
b. Rotation flow
c. Non-uniform flow
d. Uniform flow
e. Unsteady flow